Stephen J. Schueler, M.D.

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Mobitz I Heart Block Types

There are two forms of second degree heart block.

  • Type 1 AV block:
    • The time between the contraction of the atria and contraction of the ventricles lengthens, until the electrical impulse does not stimulate the ventricle to contract. This results in a missed heartbeat.
  • Type 2 AV block:
    • After a normal beat, the electrical impulse suddenly fails to cause the ventricle to contract, without an increase in time between the contraction of the atria and contraction of the ventricles.

Continue to Mobitz I Heart Block Anatomy

Last Updated: Jul 30, 2008 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Mobitz I Heart Block References
  1. Shaw DB, Gowers JI, Kekwick CA, New KH, Whistance AW. Is Mobitz type I atrioventricular block benign in adults? Heart. 2004 Feb;90(2):169-74. [14729789]
  2. Silverman ME, Upshaw CB Jr, Lange HW. Woldemar Mobitz and His 1924 classification of second-degree atrioventricular block. Circulation. 2004 Aug 31;110(9):1162-7. [15339865]
  3. Wogan JM, Lowenstein SR, Gordon GS. Second-degree atrioventricular block: Mobitz type II. J Emerg Med. 1993 Jan-Feb;11(1):47-54. [8445186]
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